Add post groups support with new controllers, views, and policies

This commit introduces comprehensive support for post groups across different domains:
- Created PostGroupsController to handle viewing post groups
- Added new views for displaying post groups and their associated posts
- Implemented policies for post groups
- Enhanced models to support post group functionality
- Updated routes to support post group navigation
- Added helper methods for post group interactions
- Improved GoodJob argument rendering for post groups

The changes provide a unified way to view and interact with post collections across different domains like Inkbunny and E621.

rake/fa.rake

@@ -176,15 +176,6 @@ namespace :fa do
     puts "#{Time.now} - browse_page_job - Domain::Fa::Job::BrowsePageJob"
   end
 
-  desc "run a single home page job"
-  task home_page_job: %i[set_logger_stdout environment] do
-    Domain::Fa::Job::HomePageJob.set(
-      priority: -20,
-      queue: "manual",
-    ).perform_later({})
-    puts "#{Time.now} - home_page_job - Domain::Fa::Job::HomePageJob"
-  end
-
   desc "run a single post scan job"
   task scan_post_job: %i[set_logger_stdout environment] do |t, args|
     fa_id = ENV["fa_id"] || raise("must provide fa_id")